fix(nix): bake shell completions into default package (#1229)

The default package now includes fish, bash, and zsh completions
at standard paths. This means users only need to install the
default package to get both the binary and completions.

The separate completion packages are kept for backwards
compatibility but now simply symlink to the default package.

Standard completion paths:
- share/fish/vendor_completions.d/bd.fish
- share/bash-completion/completions/bd
- share/zsh/site-functions/_bd

flake.nix

@@ -23,25 +23,49 @@
         system:
         let
           pkgs = nixpkgs.legacyPackages.${system};
-          bd = pkgs.callPackage ./default.nix { inherit pkgs self; };
+          bdBase = pkgs.callPackage ./default.nix { inherit pkgs self; };
+          # Wrap the base package with shell completions baked in
+          bd = pkgs.stdenv.mkDerivation {
+            pname = "beads";
+            version = bdBase.version;
+
+            phases = [ "installPhase" ];
+
+            installPhase = ''
+              mkdir -p $out/bin
+              cp ${bdBase}/bin/bd $out/bin/bd
+
+              # Generate shell completions
+              mkdir -p $out/share/fish/vendor_completions.d
+              mkdir -p $out/share/bash-completion/completions
+              mkdir -p $out/share/zsh/site-functions
+
+              $out/bin/bd completion fish > $out/share/fish/vendor_completions.d/bd.fish
+              $out/bin/bd completion bash > $out/share/bash-completion/completions/bd
+              $out/bin/bd completion zsh > $out/share/zsh/site-functions/_bd
+            '';
+
+            meta = bdBase.meta;
+          };
         in
         {
           packages = {
             default = bd;
 
+            # Keep separate completion packages for users who only want specific shells
             fish-completions = pkgs.runCommand "bd-fish-completions" { } ''
               mkdir -p $out/share/fish/vendor_completions.d
-              ${bd}/bin/bd completion fish > $out/share/fish/vendor_completions.d/bd.fish
+              ln -s ${bd}/share/fish/vendor_completions.d/bd.fish $out/share/fish/vendor_completions.d/bd.fish
             '';
 
             bash-completions = pkgs.runCommand "bd-bash-completions" { } ''
               mkdir -p $out/share/bash-completion/completions
-              ${bd}/bin/bd completion bash > $out/share/bash-completion/completions/bd
+              ln -s ${bd}/share/bash-completion/completions/bd $out/share/bash-completion/completions/bd
             '';
 
             zsh-completions = pkgs.runCommand "bd-zsh-completions" { } ''
               mkdir -p $out/share/zsh/site-functions
-              ${bd}/bin/bd completion zsh > $out/share/zsh/site-functions/_bd
+              ln -s ${bd}/share/zsh/site-functions/_bd $out/share/zsh/site-functions/_bd
             '';
           };